Year US Dollars 1970 208775000 1971 407177000 1972 495019000 1973 525580000 1974 505320000 1975 506037000 1976 520751000 1977 675812000 1978 583281000 1979 608637000 1980 719003000 1981 1184523000 1982 1627596000 1983 1867660000 1984 2029275000 1985 2112192000 1986 1984118000 1987 2275813000 1988 2249839000 1989 2316229000 1990 2593897000 1991 2774126000 1992 3788946000 1993 3268514000 1994 2792347000 1995 2505575000 1996 2507364000 1997 2589513000 1998 2712135000 1999 2657225000 2000 2325079000 2001 2047406000 2002 1856715000 2003 1863348000 2004 1769748000 2005 1870907000 2006 1754573000 2007 1530878000 2008 1436379000 2009 1768986000 2010 5987008000 2011 12584092000 2012 14922492000 2013 21609684000 2014 20428665000 2015 20493966000 2016 19688489000